Monofunctionalization of phenolic hydroxy onto a polyphenol

Details Monofunctionalization of phenolic hydroxy onto a polyphenol Monofunctionalization of phenolic hydroxy onto a polyphenol

1991-12-16

1993-03-30

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 67, 560 14, 560 64, 560 21, 560 66, 562476, 568433, 568763, 568651, 558423, 558 56, 556437, C07C 6988

Patent

active

051985713

ABSTRACT:
A region-specific monofunctionalization of a phenolic hydroxy onto a polyphenol for the preparation of a compound of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, alkyl of 1 to 8 carbon atoms, alkenyl and alkynyl of 2 to 8 carbon atoms, --CN, formyl, carboxy, alkoxy carbonyl of up to 9 carbon atoms, aralkoxy carbonyl or up to 12 carbon atoms and halogen and R' is a hydroxy protective group comprising reacting a polyphenol of the formula ##STR2## wherein R has the above definition with a base to form the corresponding dianion, reacting the latter with a trialkyl borate of the formula

REFERENCES:
Scheline, R. R. Acta Chemic. Scand. vol. 20 No. 4 p. 1182 1966 CA91:123715y 1979.

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